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authorIlya Dryomov <idryomov@gmail.com>2012-01-16 22:04:48 +0200
committerIlya Dryomov <idryomov@gmail.com>2012-01-16 22:04:48 +0200
commit9555c6c180600b40f6e86bd4dc53bf47e06ed663 (patch)
tree74f95edee2368e183a2a054c24725d2940632a8f /fs/btrfs/volumes.c
parent596410151ed71819b9e8a8018c6c9992796b256d (diff)
Btrfs: add skip_balance mount option
Since restriper kthread starts involuntarily on mount and can suck cpu and memory bandwidth add a mount option to forcefully skip it. The restriper in that case hangs around in paused state and can be resumed from userspace when it's convenient. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'fs/btrfs/volumes.c')
-rw-r--r--fs/btrfs/volumes.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 17e565388de..e0160607e6e 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2707,15 +2707,19 @@ static int balance_kthread(void *data)
struct btrfs_balance_control *bctl =
(struct btrfs_balance_control *)data;
struct btrfs_fs_info *fs_info = bctl->fs_info;
- int ret;
+ int ret = 0;
mutex_lock(&fs_info->volume_mutex);
mutex_lock(&fs_info->balance_mutex);
set_balance_control(bctl);
- printk(KERN_INFO "btrfs: continuing balance\n");
- ret = btrfs_balance(bctl, NULL);
+ if (btrfs_test_opt(fs_info->tree_root, SKIP_BALANCE)) {
+ printk(KERN_INFO "btrfs: force skipping balance\n");
+ } else {
+ printk(KERN_INFO "btrfs: continuing balance\n");
+ ret = btrfs_balance(bctl, NULL);
+ }
mutex_unlock(&fs_info->balance_mutex);
mutex_unlock(&fs_info->volume_mutex);